SIM689XM datasheet(27/55 Pages) SANKEN

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SIM689xM Series

SIM689xM-DSE Rev.3.4

SANKEN ELECTRIC CO., LTD.

Mar. 05, 2024

https://www.sanken-ele.co.jp/en

VBB

LSx

COM

OCP

COM2

A/D

RSx

DRS

VTRIP

100 kΩ

Blanking

filter

Output SW turn-off

and QFO turn-on

2 µs

2 kΩ

Figure 12-14.

Internal Circuit Diagram of OCP Pin

and Its Peripheral Circuit

Figure 12-15 is a timing chart that represents

operation waveforms during OCP operation. When the

OCP pin voltage increases to the OCP Threshold

Voltage (VTRIP = 0.50 V) or more, and remains in this

condition for a period of the OCP Blanking Time (see

Section 3.1) or longer, the OCP circuit is activated. The

enabled OCP circuit shuts off the low-side transistors

and puts the FO pin into a low state.

Then, output current decreases as a result of the

output transistor turn-offs. Even if the OCP pin voltage

falls below VTRIP, the IC holds the FO pin in the low

state for a fixed OCP hold time, tP = 10.0 ms (typ.).

Then, the output transistors operate according to input

signals.

The OCP is used for detecting abnormal conditions,

such as an output transistor shorted. In case short-circuit

conditions occur repeatedly, the output transistors can be

destroyed. For this reason, motor operations must be

controlled by the external microcontroller so that it can

immediately stop the motor when fault signals are

detected.

LINx

HINx

HOx

LOx

OCP

VTRIP

tBK

HOx responds to input signal.

FO restarts automatically after tP.

Figure 12-15.

OCP Operational Waveforms

For proper shunt resistor setting, your application

must meet the following:

● Use the shunt resistor that has a recommended

resistance, RSx (see Section 0).

● Set the OCP pin input voltage to vary within the rated

OCP pin voltages, VOCP (see Section 1).

● Keep the current through the output transistors below

the rated output current (pulse), IOP (see Section 1).

It is required to use a resistor with low internal

inductance because high-frequency switching current

will flow through the shunt resistors, RSx. In addition,

choose a resistor with allowable power dissipation

according to your application.

When you connect a CR filter (i.e., a pair of a filter

resistor, Rsx, and a filter capacitor, CO) to the OCP pin,

care should be taken in setting the time constants of RO

and CO. The larger the time constant, the longer the time

that the OCP pin voltage rises to VTRIP. And this may

cause

permanent

damage

the

transistors.

Consequently, a propagation delay of the IC must be

taken into account when you determine the time

constants. For RO and CO, their time constants must be

set to ≤0.2 µs.

Note that overcurrents are undetectable when one or

more of the U, V/V1/V2, and W1/W2 pins or their traces

are shorted to ground (ground fault). In case any of these

pins falls into a state of ground fault, the output

transistors may be destroyed.

12.4.4

Thermal Shutdown (TSD)

The SIM689xM series incorporates the thermal

shutdown (TSD) circuit. Figure 12-16 shows TSD

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